"if not" condition check (for data validation)

[Stanislav Blinov]

On Wednesday, 17 June 2020 at 23:46:54 UTC, Denis wrote:
> `if` is not a good substitute, because it works in the opposite 
> sense, often requiring lots of `not`s. As a trivial example:
>
>   assert( configfile.isFile && configfile.extension == ".conf" )
>     -vs-
>   if ( !configfile.isFile || configfile.extension != ".conf" )

> A BETTER SOLUTION ???
>
> I haven't been able to come up with another option that is more 
> efficient yet doesn't sacrifice readability. I would welcome 
> suggestions.
>
> Thanks in advance.
> Denis

if( ! (configfile.isFile && configfile.extension == ".conf") )

?